Environment
University of Michigan Duo Mobile
Issue
When trying to approve a Duo push, or add a Duo account to your iOS device (iPhone, iPad), you receive the error: NSURLErrorDomain - 1003 or 999 or 1200. (This could be any of several different numbers.)
Resolution
NSURL is a legacy API on iOS devices and can prevent Duo Mobile from achieving adequate network connectivity. The error typically means that it can't communicate with a server.
To resolve the error, try the following troubleshooting steps:
- Switch to an alternative WiFi network and try again
- If you are on the MGuest network, forget the network in settings, switch to MWireless and try again
- Turn off WiFi to force your device to use cellular data, and try again
- Update to the latest version of iOS and try again
Additional Information
Need additional information or assistance? Contact the ITS Service Center.